=========================================================================Ubuntu Security Notice USN-4971-1
June 01, 2021

libwebp vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

libwebp could be made to crash or run programs as your login if it
opened a specially crafted file.

Software Description:
- libwebp: Lossy compression of digital photographic images.

Details:

It was discovered that libwebp incorrectly handled certain malformed
images. If a user or automated system were tricked into opening a specially
crafted image file, a remote attacker could use this issue to cause libwebp
to crash, resulting in a denial of service, or possibly execute arbitrary
code.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.04:
  libwebp6                        0.6.1-2ubuntu0.21.04.1
  libwebpdemux2                   0.6.1-2ubuntu0.21.04.1
  libwebpmux3                     0.6.1-2ubuntu0.21.04.1

Ubuntu 20.10:
  libwebp6                        0.6.1-2ubuntu0.20.10.1
  libwebpdemux2                   0.6.1-2ubuntu0.20.10.1
  libwebpmux3                     0.6.1-2ubuntu0.20.10.1

Ubuntu 20.04 LTS:
  libwebp6                        0.6.1-2ubuntu0.20.04.1
  libwebpdemux2                   0.6.1-2ubuntu0.20.04.1
  libwebpmux3                     0.6.1-2ubuntu0.20.04.1

Ubuntu 18.04 LTS:
  libwebp6                        0.6.1-2ubuntu0.18.04.1
  libwebpdemux2                   0.6.1-2ubuntu0.18.04.1
  libwebpmux3                     0.6.1-2ubuntu0.18.04.1

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-4971-1
  CVE-2018-25009, CVE-2018-25010, CVE-2018-25011, CVE-2018-25012,
  CVE-2018-25013, CVE-2018-25014, CVE-2020-36328, CVE-2020-36329,
  CVE-2020-36330, CVE-2020-36331, CVE-2020-36332

Package Information:
  https://launchpad.net/ubuntu/+source/libwebp/0.6.1-2ubuntu0.21.04.1
  https://launchpad.net/ubuntu/+source/libwebp/0.6.1-2ubuntu0.20.10.1
  https://launchpad.net/ubuntu/+source/libwebp/0.6.1-2ubuntu0.20.04.1
  https://launchpad.net/ubuntu/+source/libwebp/0.6.1-2ubuntu0.18.04.1